<template>
  <div>
    <table
      border="1"
      width="700"
      style="border-collapse: collapse"
    >
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th>
            <input type="checkbox"  v-model="isAll" /> <span>全选</span>
          </th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <ShoppingCar v-for="(item,index) in goodList" :key="index"
        :name='item.name'
        :price='item.price'
        :num='item.num'
        :index="index"
        :checked="item.checked"
        @delFn='delFn'
        @redFn='redFn'
        @addFn='addFn'
        @changecheck='getcheck'
          />
      </tbody>
      <tfoot>
        <Sum :sum="goodList" />
       
      </tfoot>
    </table>
  </div>
</template>

<script>
import ShoppingCar from './components/Zy4.1.vue'
import Sum from './components/Zy4.2.vue'
export default {
  components:{
    ShoppingCar,
    Sum
  },
  data() {
    return {
      goodList: [
        {
          name: "诸葛亮",
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: "蔡文姬",
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: "妲己",
          price: 2000,
          num: 1,
          checked: false,
        },
        {
          name: "鲁班",
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
    };
  },
  methods:{
    delFn(index) {
      this.goodList.splice(index,1)
    },
    redFn(index) {
      if (this.goodList[index].num <= 1) return
      this.goodList[index].num--
    },
    addFn(index) {
      this.goodList[index].num++
    },
    getcheck(checked,index) {
      this.goodList[index].checked = checked;
    },
  },
  computed:{
    isAll:{
      get() {
        if(this.goodList.length == 0) return
        return this.goodList.every(item=> item.checked);
      },
      set(val) {
        this.goodList.forEach(item => item.checked = val);
      },
    }
  }
};
</script>

<style>
</style>